Lubricating oil composition

Abstract

The present invention is directed to a lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity (b) a mixture of a potassium overbased detergent and a calcium overbased detergent (c) one or more anti-oxidants (d) one or more derivatized succinimide dispersants and (e) one or more anti-wear agents, wherein the lubricating oil composition contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate. The present invention is also directed to a lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a mixture of a potassium overbased mono-alkyl carboxylate and a calcium overbased alkylaryl sulfonate (c) an amine-containing anti-oxidant (d) an ethylene carbonate treated succinimide dispersant and (e) a phosphorus-containing anti-wear agent, wherein the lubricating oil composition contains no more than 0.1 weight percent of potassium and no more than 0.12 weight percent phosphorus and provided the lubricating oil composition does not contain a di-alkyl carboxylate. The present invention is also directed to method for reducing catalyst poisoning in exhaust after treatment systems in internal combustion engines, which comprises operating the engine with the lubricating oil compositions of the present invention.

1 . A lubricating oil composition comprising: 
 (a) a major amount of an oil of lubricating viscosity;    (b) a mixture of a potassium overbased detergent and a calcium overbased detergent;    (c) one or more anti-oxidants;    (d) one or more derivatized succinimide dispersants; and    (e) one or more anti-wear agents;    wherein the lubricating oil composition contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate.    
   
   
       2 . The lubricating of  claim 1 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 0.5:1.0 to about 10.0:1.0.  
   
   
       3 . The lubricating of  claim 2 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 1.0:1.0 to about 7.5:1.0.  
   
   
       4 . The lubricating of  claim 3 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 2.0:1.0 to about 5.0:1.0.  
   
   
       5 . The lubricating of  claim 4 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is 3.5:1.0.  
   
   
       6 . The lubricating oil composition of  claim 1 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 1.0 weight percent to about 10.0 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       7 . The lubricating oil composition of  claim 6 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 1.5 weight percent to about 7.5 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       8 . The lubricating oil composition of  claim 7 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 2.0 weight percent to about 5.0 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       9 . The lubricating oil composition of  claim 8 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 2.5 weight percent to about 3.0 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       10 . The lubricating oil composition of  claim 1 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 1.0 weight percent to about 15.0 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       11 . The lubricating oil composition of  claim 10 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 2.0 weight percent to about 10.0 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       12 . The lubricating oil composition of  claim 11 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 3.0 weight percent to about 7.5 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       13 . The lubricating oil composition of  claim 12 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 4.0 weight percent to about 6.0 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       14 . The lubricating oil composition of  claim 1 , wherein the phosphorus content is in the range of 0.03 weight percent to about 0.12 weight percent based on the total weight of the lubricating oil composition.  
   
   
       15 . The lubricating oil composition of  claim 14 , wherein the phosphorus content is in the range of 0.05 weight percent to about 0.1 weight percent based on the total weight of the lubricating oil composition.  
   
   
       16 . The lubricating oil composition of  claim 15 , wherein the phosphorus content is in the range of 0.07 weight percent to about 0.09 weight percent based on the total weight of the lubricating oil composition.  
   
   
       17 . A lubricating oil composition comprising: 
 (a) a major amount of an oil of lubricating viscosity;    (b) a mixture of a potassium overbased mono-alkyl carboxylate and a calcium overbased alkylaryl sulfonate;    (c) an amine-containing anti-oxidant;    (d) an ethylene carbonate treated succinimide dispersant; and    (e) a phosphorus-containing anti-wear agent;    wherein the lubricating oil composition no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate detergent.    
   
   
       18 . The lubricating oil composition of  claim 17 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 0.5:1.0 to about 10.0:1.0.  
   
   
       19 . The lubricating oil composition of  claim 18 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 1.0:1.0 to about 7.5:1.0.  
   
   
       20 . The lubricating oil composition of  claim 19 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 2.0:1.0 to about 5.0:1.0.  
   
   
       21 . The lubricating oil composition of  claim 20 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is 3.5:1.0.  
   
   
       22 . The lubricating oil composition of  claim 17 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 1.0 weight percent to about 10.0 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       23 . The lubricating oil composition of  claim 22 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 1.5 weight percent to about 7.5 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       24 . The lubricating oil composition of  claim 23 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 2.0 weight percent to about 5.0 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       25 . The lubricating oil composition of  claim 24 , wherein the concentration of the potassium in the potassium overbased detergent is in the range of about 2.5 weight percent to about 3.0 weight percent based on the total weight of the potassium overbased detergent.  
   
   
       26 . The lubricating oil composition of  claim 17 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 1.0 weight percent to about 15.0 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       27 . The lubricating oil composition of  claim 26 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 2.0 weight percent to about 10.0 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       28 . The lubricating oil composition of  claim 27 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 3.0 weight percent to about 7.5 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       29 . The lubricating oil composition of  claim 28 , wherein the concentration of the calcium in the calcium overbased detergent is in the range of about 4.0 weight percent to about 6.0 weight percent based on the total weight of the calcium overbased detergent.  
   
   
       30 . The lubricating oil composition of  claim 17 , wherein the phosphorus content is in the range of 0.03 weight percent to about 0.12 weight percent based on the total weight of the lubricating oil composition.  
   
   
       31 . The lubricating oil composition of  claim 30 , wherein the phosphorus content is in the range of 0.05 weight percent to about 0.1 weight percent based on the total weight of the lubricating oil composition.  
   
   
       32 . The lubricating oil composition of  claim 31 , wherein the phosphorus content is in the range of 0.07 weight percent to about 0.09 weight percent based on the total weight of the lubricating oil composition.  
   
   
       33 . The lubricating oil composition of  claim 17 , wherein the phosphorus-containing anti-wear agent is a metal di-alkyl di-thiophosphate.  
   
   
       34 . The lubricating oil composition of  claim 33 , wherein the metal in the metal di-alkyl di-thiophosphate is zinc.  
   
   
       35 . A lubricating oil concentrate comprising: 
 (a) about 10 weight percent to about 90 weight percent of an oil of lubricating viscosity;    (b) a mixture of a potassium overbased detergent and a calcium overbased detergent;    (c) one or more anti-oxidants;    (d) one or more derivatized succinimides; and    (e) one or more anti-wear agents;    wherein the lubricating oil concentrate contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate.    
   
   
       36 . The lubricating oil concentrate of  claim 35 , wherein the phosphorus-containing anti-wear agent is zinc di-alkyl di-thiophosphate.  
   
   
       37 . A lubricating oil concentrate comprising: 
 (a) from about 10 weight percent to about 90 weight percent an oil of lubricating viscosity based on the total weight of the lubricating oil concentrate;    (b) a mixture of a potassium overbased mono-alkyl carboxylate and a calcium overbased alkylaryl sulfonate;    (c) an amine-containing anti-oxidant;    (d) an ethylene carbonate treated succinimide dispersant; and    (e) a phosphorus-containing anti-wear agent;    wherein the lubricating oil concentrate contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate detergent.    
   
   
       38 . The lubricating oil concentrate of  claim 37 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 0.5:1.0 to about 10.0:1.0.  
   
   
       39 . The lubricating oil concentrate of  claim 38 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 1.0:1.0 to about 7.5:1.0.  
   
   
       40 . The lubricating oil concentrate of  claim 39 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 2.0:1.0 to about 5.0:1.0.  
   
   
       41 . The lubricating oil concentrate of  claim 40 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is 3.5:1.0.  
   
   
       42 . The lubricating oil concentrate of  claim 37 , wherein the phosphorus-containing anti-wear agent is zinc di-alkyl di-thiophosphate.  
   
   
       43 . A method for reducing catalyst poisoning in exhaust after treatment systems in internal combustion engines, which comprises operating the engine with a lubricating oil composition comprising: 
 (a) about 10 weight percent to about 90 weight percent of an oil of lubricating viscosity;    (b) a mixture of a potassium overbased detergent and a calcium overbased detergent;    (c) one or more anti-oxidants;    (d) one or more derivatized succinimides; and    (e) one or more anti-wear agents;    wherein the lubricating oil concentrate contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate.    
   
   
       44 . The method of  claim 43 , wherein the internal combustion engines are diesel engines, gasoline engines and natural gas engines.  
   
   
       45 . The method of  claim 43 , wherein the phosphorus-containing anti-wear agent is zinc di-alkyl di-thiophosphate.  
   
   
       46 . A method for reducing catalyst poisoning in exhaust after treatment systems in internal combustion engines, which comprises operating the engine with a lubricating oil composition comprising: 
 (a) a major amount of an oil of lubricating viscosity;    (b) a mixture of a potassium overbased mono-alkyl carboxylate and a calcium overbased alkylaryl sulfonate;    (c) an amine-containing anti-oxidant and a phenolic anti-oxidant;    (d) an ethylene carbonate treated succinimide dispersant; and    (e) a phosphorus-containing anti-wear agent;    wherein the lubricating oil composition contains no more than 0.12 weight percent phosphorus, and provided the lubricating oil composition does not contain a di-alkyl carboxylate detergent.    
   
   
       47 . The method of  claim 46 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 0.5:1.0 to about 10.0:1.0.  
   
   
       48 . The method of  claim 47 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 1.0:1.0 to about 7.5:1.0.  
   
   
       49 . The method of  claim 48 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is in the range of from about 2.0:1.0 to about 5.0:1.0.  
   
   
       50 . The method of  claim 49 , wherein the ratio of the potassium overbased detergent to the calcium overbased detergent in the lubricating oil composition of the present is 3.5:1.0.  
   
   
       51 . The method of  claim 46 , wherein the internal combustion engines are diesel engines, gasoline engines and natural gas engines.  
   
   
       52 . The method of  claim 46 , wherein the phosphorus-containing anti-wear agent is zinc di-alkyl di-thiophosphate.